"""SCons.Tool.ipkg

Tool-specific initialization for ipkg.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

The ipkg tool calls the ipkg-build. Its only argument should be the 
packages fake_root.
"""

#
# Copyright (c) 2001 - 2017 The SCons Foundation
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
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# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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__revision__ = "src/engine/SCons/Tool/ipkg.py 74b2c53bc42290e911b334a6b44f187da698a668 2017/11/14 13:16:53 bdbaddog"

import os

import SCons.Builder

def generate(env):
    """Add Builders and construction variables for ipkg to an Environment."""
    try:
        bld = env['BUILDERS']['Ipkg']
    except KeyError:
        bld = SCons.Builder.Builder(action='$IPKGCOM',
                                    suffix='$IPKGSUFFIX',
                                    source_scanner=None,
                                    target_scanner=None)
        env['BUILDERS']['Ipkg'] = bld


    env['IPKG'] = 'ipkg-build'
    env['IPKGCOM'] = '$IPKG $IPKGFLAGS ${SOURCE}'

    if env.WhereIs('id'):
        env['IPKGUSER'] = os.popen('id -un').read().strip()
        env['IPKGGROUP'] = os.popen('id -gn').read().strip()
    env['IPKGFLAGS'] = SCons.Util.CLVar('-o $IPKGUSER -g $IPKGGROUP')
    env['IPKGSUFFIX'] = '.ipk'

def exists(env):
    """
    Can we find the tool
    """
    return env.Detect('ipkg-build')

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